| 摘要 |
A radio receiver circuit (100) is used for receiving a multi-level signal from a radio communication system. The multi-level signal includes a plurality of symbols, wherein each level is representative of a symbol of data. The receiver circuit (100) includes a demodulator circuit (106) and a digital circuit (112). The demodulator circuit (106) is used for receiving the multi-level signal and for generating baseband samples for each symbol, whereby each sample has a phase and a signal level. The digital circuit (112) is coupled to the demodulator circuit (106), and is adapted to tally, by category, occurrences of the baseband samples, whereby each category is representative of one of a plurality of phases, and one of a plurality of signal level ranges. The digital circuit (112) is further adapted to correlate the categories to at least one predetermined template, and to classify the multi-level signal according to the correlation results.
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